 
Coronary angiography: Two patients with a LIMA to LAD graft. In both patients the arterial bypass graft is free of any stenosis. However, note the normal contrast flow in patient 1 in comparison to the delayed flow through the LAD graft in patient 2, which might be related to a higher peripheral resistance. This delay of contrast arrival through LIMA may impair the interpretation of single-bolus first pass perfusion scans.
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